So I got an email from Superior today asking me if I would be alright with the thin walled counterbalanced crankshaft minus the counter weights instead of the standard hollow crank. This is the crankshaft that goes in all their 200 HP models and is actually more efficient, seems they are having some problems getting the regular ones from the supplier. Should have the engine built and tested in 4 weeks or so! Right when I am scheduled to be back! Better parts for the same price? No complaints here.
Here are some specs on the engine from Superior themselves:
We have created the best crankshaft available for the XP-360, made from aerospace grade SAE 4340 Vacuum-Arc-Remelt (V.A.R.) steel per AMS 6414. To reduce engine vibration, component wear, and pilot fatigue, each crankshaft is painstakingly balanced to within one-quarter oz-inch. Inside the front main oil reservoir you’ll find a smooth, groove-free, plated I.D. surface that won’t hold oil acids or corrode, relieving you of any worries about future Lycoming-style SB 505 inspections. Of course, many other dimensional tolerances, surface finishes, and processes are held to the highest standards for this very important component of your engine.
Computer optimized camshaft intake and exhaust valve lobe design.
The camshaft ‘brain’ of your XP-360 engine is designed for better cruise economy, lower valve-train loads, and smoother idle and power operation. The camshaft intake and exhaust valve lobes have been computer optimized. Lower valve-train loads reduce camshaft and lifter spalling and decrease valve-train and guide wear and friction. Precisely timed camshaft lobe valve events eliminate re-ingestion of exhaust gases and improve economy and overall performance. Idle and power vibration characteristics are also computer optimized to passenger car standards to reduce pilot fatigue and component wear.
Improved Crankcase has reinforced cylinder decks, balanced oil system and thrust face lubrication.
The crankcase is made from aerospace grade AA C355-T71 stabilized structural aluminum alloy per AMS 4214. The reinforced crankcase cylinder deck eliminates deck-to-deck cracking. The balanced oil system lubricates the crankshaft and camshaft from either side of the crankcase. This reduces oil pressure fluctuations and equalizes oil flow through the entire engine, including the lifters. Pressurized oil lubricates the crankcase thrust face, reducing friction on the loaded surface of the case where the crank pulls the case forward. Every crankcase also comes machined to accept piston cooling oil nozzles.
Dynamically balanced Connecting Rods and Pistons.
Each engine comes with a set of statically and dynamically balanced connecting rods. These rods are made from precision forged high-strength aerospace grade SAE 8740 forgings per AMS 6325. Consistent precision machining of these forgings and installation as matched-weight sets yield a statically and dynamically balanced set of connecting rods for reduced vibration and wear. But balanced rotating components don’t stop there, add in Superior’s matched-weight piston sets and you have the most dynamically balanced engine available.
Oil Sump with an improved, high-flow induction system.
The sump is made from aerospace grade AA C355-T71 stabilized structural aluminum alloy per AMS 4214. A smoother intake manifold and plenum system reduces aerodynamic drag for better breathing of all four cylinders, while at the same time a plenum turbulator improves air-fuel mixing. Tuned intake tubes balance the intake air runner length to further improve engine breathing. Polished stainless-steel intake tubes eliminate rusting from the elements and give your engine that special, first-class look.
Millennium Standard-Cast Cylinders
Of course, you can’t go wrong with Superior’s legendary Standard-Cast Cylinders with 6% better volumetric efficiency, through-hardened steel barrels, and Superior’s bullet-proof head design.
Comprehensive Factory-New Engine Warranty
Superior Air Parts, Inc. warrants the XP-360 Engine® to be free from defects in material and workmanship for ONE (1) YEAR, or an optional THREE (3) YEARS for an additional charge, from the date of purchase.
Fuel Injected or Carbureted, 4 Cylinder, Horizontally Opposed, Constant Speed or Fixed Pitch Propeller, Dynafocal or Conical Mounts
Compression Ratio: 8.5:1
Displacement: 361 cubic inches
Firing Order: 1-3-2-4
Minimum Fuel Grade: 91 Octane
Rated Power: 180 BHP
Maximum RPM: 2700 RPM
Weight: 290 pounds fuel injected
Weight: 287 pounds carbureted
Dimensions (HxWxD): 24.0″x 33.4″x 32.8″
TBO: 2000 Hour
Warranty: Superior Air Parts, Inc. warrants the XP-360 Engine® to be free from defects in material and workmanship for ONE (1) YEAR, or an optional THREE (3) YEARS for an additional charge, from the date of purchase.
Cylinder Head Temperature:
Maximum CHT (leaded fuel): 450°F
Maximum CHT (unleaded fuel): 430°F
Maximum Recommended Cruise CHT: 400°F
Recommended Cruise Oil Temp: 170°F
Normal Oil Pressure: 60 to 90 psi
Oil Capacity: 8 quarts
Minimum Safe Oil Level: 3 quarts
Equipped with Oil Filter and Oil Screen
Oil Change Interval: 50 Hours or 6 Months
Max Oil Consumption: 5 Hours per Quart
Recommended Mil-L-22851 Ashless Dispersant Oils (avg air temp):
All Temperatures: SAE 15W50 or 20W50
Cold (50°F): SAE 50
Bore: 5.125 inches
Stroke: 4.375 inches
Spark Timing (leaded): 25 degrees BTC
Spark Timing (unleaded): 22 degrees BTC
Propeller Drive Ratio 1:1
Propeller Rotation (from rear): Clockwise
Equipped w/ Constant Speed Prop Gov Adapter
Valve Rocker Arms lash: .028-.080
75% Performance (Rich) Cruise: 135 HP @ 25″x2400 RPM: 11.7 Gal/Hr.
73% Economy (Lean) Cruise: 131 HP @ 25″x2400 RPM: 9.7 Gal/Hr.
65% Performance (Rich) Cruise: 117 HP @ 23″x2300 RPM: 9.9 Gal/Hr.
62% Economy (Lean) Cruise: 111 HP @ 23″x2300 RPM: 8.2 Gal/Hr.
55% Economy Cruise: 100 HP @ 21″x2300 RPM: 7.8 Gal/Hr.
Brake Specific Fuel Consumption:
Rich of Peak EGT Operation: .50 Lbs/Bhp-Hr
Lean of Peak EGT Operation: .45 Lbs/Bhp-Hr